serene · adjective, verb, noun1
- Latin · derived fromserēnus“clear, cloudless, untroubled”
- English todayserene
From Middle English, borrowed from Latin serēnus (“clear, cloudless, untroubled”).
serene · noun2
- Vulgar Latin · derived from*serānum
- Old French · derived fromserein“evening”
- Middle French · borrowed fromserein
- English todayserene
Borrowed from Middle French serein, from Old French serein (“evening”), from Vulgar Latin *serānum, from substantive use of sērum, neuter of sērus (“late”) + -ānus suffix.
Etymology from Wiktionary, CC BY-SA 4.0.